/* ============================================================
   MiniPM 推理游戏 - 主样式表
   主题: 神秘侦探 + AI 科幻
   ============================================================ */

/* --- CSS 变量 --- */
:root {
  --mystery-purple: #7c3aed;
  --mystery-indigo: #4f46e5;
  --mystery-teal: #14b8a6;
  --mystery-amber: #f59e0b;
  --mystery-rose: #f43f5e;
  --mystery-cyan: #06b6d4;

  --dark-900: #0a0a1a;
  --dark-800: #12122a;
  --dark-700: #1e1e3a;
  --dark-600: #2a2a4a;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --white: #ffffff;

  --gradient-primary: linear-gradient(135deg, #7c3aed, #06b6d4);
  --gradient-accent: linear-gradient(135deg, #4f46e5, #f59e0b);
  --gradient-full: linear-gradient(135deg, #7c3aed, #06b6d4, #f59e0b);
  --gradient-text: linear-gradient(135deg, #a78bfa, #22d3ee);
  --gradient-hero: linear-gradient(135deg, #0a0a1a 0%, #0f0a2e 30%, #12122a 60%, #0a1a1a 100%);
  --gradient-card: linear-gradient(135deg, rgba(124,58,237,0.08), rgba(6,182,212,0.08));
  --gradient-glow: linear-gradient(135deg, rgba(124,58,237,0.15), rgba(6,182,212,0.10), rgba(245,158,11,0.08));

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.15);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.2);
  --shadow-glow-purple: 0 0 30px rgba(124,58,237,0.15);
  --shadow-glow-cyan: 0 0 30px rgba(6,182,212,0.15);
  --shadow-glow: 0 0 30px rgba(124,58,237,0.12);

  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  --section-padding: 100px 0;
}

/* --- Reset --- */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 70px; }
body {
  font-family: var(--font-sans);
  color: var(--gray-800);
  background: var(--dark-900);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  color: #e2e8f0;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; }

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--dark-800); }
::-webkit-scrollbar-thumb { background: var(--dark-600); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--mystery-purple); }

/* --- Typography --- */
h1, h2, h3, h4 { font-weight: 700; line-height: 1.3; color: var(--white); }

.section-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--mystery-cyan);
  background: linear-gradient(135deg, rgba(124,58,237,0.15), rgba(6,182,212,0.15));
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 16px;
  border: 1px solid rgba(124,58,237,0.2);
}

.section-title {
  font-size: clamp(28px, 4vw, 42px);
  margin-bottom: 12px;
  letter-spacing: -0.5px;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: 16px;
  color: var(--gray-400);
  max-width: 600px;
  margin: 0 auto 48px;
  line-height: 1.8;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ============================================================
   HEADER / NAVIGATION
   ============================================================ */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(10,10,26,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(124,58,237,0.1);
  transition: var(--transition);
}
.header.scrolled {
  background: rgba(10,10,26,0.95);
  box-shadow: 0 4px 30px rgba(0,0,0,0.3);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo-icon { font-size: 24px; }
.logo-text {
  font-size: 18px;
  font-weight: 700;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.logo-text small {
  font-size: 13px;
  font-weight: 400;
  -webkit-text-fill-color: var(--gray-400);
  color: var(--gray-400);
}

.nav { display: flex; align-items: center; gap: 2px; }
.nav a {
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-400);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.nav a:hover { color: var(--mystery-cyan); background: rgba(6,182,212,0.08); }
.nav a.nav-cta {
  background: var(--gradient-primary);
  color: var(--white);
  padding: 8px 20px;
  margin-left: 8px;
}
.nav a.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow-purple);
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 8px;
  padding: 6px 10px;
  font-size: 13px;
  font-weight: 500;
  color: var(--gray-500);
  border: 1px solid rgba(124,58,237,0.2);
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: transparent;
  transition: var(--transition);
}
.lang-switch:hover { border-color: var(--mystery-cyan); color: var(--mystery-cyan); }
.lang-wrap { position: relative; }
.lang-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 4px;
  background: var(--dark-800);
  border: 1px solid rgba(124,58,237,0.2);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  min-width: 140px;
  display: none;
  z-index: 100;
  overflow: hidden;
}
.lang-dropdown.open { display: block; }
.lang-dropdown a {
  display: block;
  padding: 8px 14px;
  font-size: 13px;
  color: var(--gray-400);
  text-decoration: none;
  transition: var(--transition);
}
.lang-dropdown a:hover { background: rgba(124,58,237,0.1); color: var(--mystery-cyan); }

.mobile-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; background: none; border: none; }
.mobile-toggle span { display: block; width: 24px; height: 2px; background: var(--gray-300); border-radius: 2px; transition: var(--transition); }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  background: var(--gradient-hero);
}
.hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(135deg, rgba(124,58,237,0.12), rgba(6,182,212,0.08), rgba(245,158,11,0.06), rgba(79,70,229,0.10));
  background-size: 400% 400%;
  animation: heroColorFlow 12s ease infinite;
  pointer-events: none;
  z-index: 0;
}
.hero-grid {
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%237c3aed' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}
.hero-glow {
  position: absolute;
  top: -20%; left: -10%;
  width: 120vw; height: 120vw;
  background: radial-gradient(circle at 40% 50%, rgba(124,58,237,0.10) 0%, rgba(6,182,212,0.05) 25%, transparent 50%);
  pointer-events: none;
  z-index: 0;
  will-change: transform;
}
.hero-glow-2 {
  position: absolute;
  bottom: -30%; right: -10%;
  width: 100vw; height: 100vw;
  background: radial-gradient(circle at 60% 50%, rgba(245,158,11,0.06) 0%, rgba(79,70,229,0.04) 25%, transparent 50%);
  pointer-events: none;
  z-index: 0;
  will-change: transform;
}

#neuralCanvas {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.6;
}

@keyframes heroColorFlow {
  0% { background-position: 0% 50%; opacity: 0.3; }
  25% { background-position: 100% 0%; opacity: 0.7; }
  50% { background-position: 50% 100%; opacity: 0.8; }
  75% { background-position: 0% 100%; opacity: 0.6; }
  100% { background-position: 0% 50%; opacity: 0.3; }
}

.hero .container { position: relative; z-index: 1; text-align: center; padding-top: 80px; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, rgba(124,58,237,0.12), rgba(6,182,212,0.12));
  border: 1px solid rgba(6,182,212,0.2);
  color: var(--mystery-cyan);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 24px;
  backdrop-filter: blur(4px);
}
.hero h1 {
  font-size: clamp(26px, 3.5vw, 50px);
  color: var(--white);
  margin-bottom: 24px;
  letter-spacing: -1px;
  line-height: 1.35;
}
.hero h1 span {
  background: linear-gradient(135deg, #ffffff 0%, #c4b5fd 40%, #67e8f9 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: textGradientShift 8s ease-in-out infinite;
  background-size: 400% 400%;
  filter: drop-shadow(0 0 30px rgba(124,58,237,0.10));
}
.hero h1 .hero-slogan-lg {
  font-size: clamp(32px, 5vw, 56px);
}
@keyframes textGradientShift {
  0%,100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}
.hero p {
  font-size: 17px;
  color: rgba(255,255,255,0.5);
  max-width: 680px;
  margin: 0 auto 36px;
  line-height: 1.8;
}
.hero-btns { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 36px;
  background: var(--gradient-primary);
  color: var(--white);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  background-size: 200% 200%;
  position: relative;
  overflow: hidden;
}
.btn-primary::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0), rgba(255,255,255,0.1), rgba(255,255,255,0));
  transform: translateX(-100%);
  transition: transform 0.6s;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 30px rgba(124,58,237,0.25); background-position: 100% 50%; }
.btn-primary:hover::after { transform: translateX(100%); }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 36px;
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.btn-secondary:hover {
  border-color: var(--mystery-cyan);
  color: var(--mystery-cyan);
  transform: translateY(-2px);
}

.hero-scroll {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  animation: bounce 2s infinite;
}
.hero-scroll a { color: rgba(255,255,255,0.3); font-size: 14px; display: flex; flex-direction: column; align-items: center; gap: 4px; }
@keyframes bounce { 0%,100% { transform: translateX(-50%) translateY(0); } 50% { transform: translateX(-50%) translateY(8px); } }

/* ============================================================
   COMMON SECTIONS
   ============================================================ */
section { padding: var(--section-padding); position: relative; }
section:nth-child(even) { background: var(--dark-800); }
.section-center { text-align: center; }

/* ============================================================
   WORLD SHOWCASE
   ============================================================ */
.world-showcase {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  max-width: 1100px;
  margin: 0 auto;
}
.world-card {
  background: var(--dark-700);
  border: 1px solid rgba(124,58,237,0.1);
  border-radius: var(--radius-md);
  padding: 36px 24px;
  text-align: center;
  transition: var(--transition);
}
.world-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow-purple);
  border-color: rgba(124,58,237,0.3);
}
.world-card-icon { font-size: 48px; margin-bottom: 16px; }
.world-card h3 { font-size: 18px; margin-bottom: 12px; }
.world-card p { font-size: 14px; color: var(--gray-400); line-height: 1.7; }

/* ============================================================
   CASES GALLERY
   ============================================================ */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 1100px;
  margin: 0 auto;
}
.case-card {
  background: var(--dark-700);
  border: 1px solid rgba(124,58,237,0.1);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  text-align: left;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.case-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 3px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: var(--transition);
}
.case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(124,58,237,0.25);
}
.case-card:hover::before { opacity: 1; }
.case-card-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.case-difficulty {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 4px;
  letter-spacing: 0.5px;
}
.case-difficulty.easy { background: rgba(16,185,129,0.15); color: #34d399; }
.case-difficulty.normal { background: rgba(245,158,11,0.15); color: #fbbf24; }
.case-difficulty.hard { background: rgba(239,68,68,0.15); color: #f87171; }
.case-difficulty.expert { background: rgba(124,58,237,0.15); color: #a78bfa; }
.case-status {
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 4px;
  background: rgba(6,182,212,0.1);
  color: var(--mystery-cyan);
}
.case-card h3 { font-size: 17px; margin-bottom: 8px; }
.case-card p {
  font-size: 13px;
  color: var(--gray-400);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 16px;
}
.case-meta {
  display: flex;
  gap: 16px;
  font-size: 12px;
  color: var(--gray-500);
}
.case-progress-bar {
  margin-top: 12px;
  height: 3px;
  background: var(--dark-600);
  border-radius: 2px;
  overflow: hidden;
}
.case-progress-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 2px;
  transition: width 0.5s;
}

.cases-more { margin-top: 36px; }
.cases-more .btn-primary { font-size: 14px; padding: 10px 28px; }

/* ============================================================
   FEATURES
   ============================================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 1100px;
  margin: 0 auto;
}
.feature-card {
  background: var(--dark-700);
  border: 1px solid rgba(124,58,237,0.1);
  border-radius: var(--radius-md);
  padding: 32px 20px;
  text-align: center;
  transition: var(--transition);
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow-cyan);
  border-color: rgba(6,182,212,0.25);
}
.feature-canvas { display: block; margin: 0 auto 16px; width: 80px; height: 80px; }
.feature-card h3 { font-size: 16px; margin-bottom: 10px; }
.feature-card p { font-size: 14px; color: var(--gray-400); line-height: 1.7; }

/* ============================================================
   NPC CHARACTERS
   ============================================================ */
.npcs-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 900px;
  margin: 0 auto;
}
.npc-card {
  background: var(--dark-700);
  border: 1px solid rgba(124,58,237,0.1);
  border-radius: var(--radius-md);
  padding: 32px 20px;
  text-align: center;
  transition: var(--transition);
}
.npc-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow-purple);
  border-color: rgba(124,58,237,0.25);
}
.npc-avatar { font-size: 48px; margin-bottom: 12px; }
.npc-card h4 { font-size: 16px; margin-bottom: 4px; }
.npc-role {
  display: inline-block;
  font-size: 11px;
  font-weight: 500;
  padding: 2px 10px;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(124,58,237,0.15), rgba(6,182,212,0.15));
  color: var(--mystery-cyan);
  margin-bottom: 12px;
}
.npc-card p { font-size: 13px; color: var(--gray-400); line-height: 1.6; }

/* ============================================================
   LEADERBOARD
   ============================================================ */
.leaderboard-wrap {
  max-width: 800px;
  margin: 0 auto;
  background: var(--dark-700);
  border: 1px solid rgba(124,58,237,0.1);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.leaderboard-header {
  display: grid;
  grid-template-columns: 60px 1fr 100px 100px 120px;
  padding: 16px 24px;
  background: linear-gradient(135deg, rgba(124,58,237,0.15), rgba(6,182,212,0.1));
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: 1px;
}
.leaderboard-body { }
.leaderboard-row {
  display: grid;
  grid-template-columns: 60px 1fr 100px 100px 120px;
  padding: 14px 24px;
  font-size: 14px;
  border-bottom: 1px solid rgba(124,58,237,0.05);
  transition: var(--transition);
  align-items: center;
}
.leaderboard-row:hover { background: rgba(124,58,237,0.05); }
.leaderboard-row:last-child { border-bottom: none; }
.leaderboard-row .rank {
  font-weight: 700;
  color: var(--gray-500);
}
.leaderboard-row .rank.top1 { color: #fbbf24; }
.leaderboard-row .rank.top2 { color: #94a3b8; }
.leaderboard-row .rank.top3 { color: #d97706; }
.leaderboard-row .player { display: flex; align-items: center; gap: 10px; color: var(--white); font-weight: 500; }
.leaderboard-row .player .avatar { width: 28px; height: 28px; border-radius: 50%; background: var(--gradient-primary); display: flex; align-items: center; justify-content: center; font-size: 14px; }
.leaderboard-row .score { color: var(--mystery-amber); font-weight: 600; }
.leaderboard-row .cases { color: var(--gray-400); }
.leaderboard-row .time { color: var(--gray-400); font-size: 13px; }

/* ============================================================
   CALL TO ACTION
   ============================================================ */
.cta-section {
  background: linear-gradient(135deg, var(--dark-900), var(--dark-700)) !important;
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(124,58,237,0.06) 0%, transparent 50%),
              radial-gradient(circle at 70% 50%, rgba(6,182,212,0.04) 0%, transparent 50%);
  pointer-events: none;
}
.cta-title {
  font-size: clamp(28px, 4vw, 42px);
  margin-bottom: 16px;
  position: relative;
}
.cta-subtitle {
  font-size: 17px;
  color: var(--gray-400);
  margin-bottom: 36px;
  line-height: 1.8;
  position: relative;
}
.cta-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; position: relative; }
.btn-cta { font-size: 18px; padding: 16px 48px; }
.cta-features {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-top: 40px;
  flex-wrap: wrap;
  position: relative;
}
.cta-features span {
  font-size: 14px;
  color: var(--gray-500);
  padding: 8px 16px;
  background: rgba(124,58,237,0.06);
  border: 1px solid rgba(124,58,237,0.1);
  border-radius: 20px;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--dark-900);
  border-top: 1px solid rgba(124,58,237,0.08);
  color: rgba(255,255,255,0.6);
  padding: 60px 0 30px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 28px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  align-items: start;
}
.footer-logo { font-size: 18px; font-weight: 700; color: var(--white); margin-bottom: 12px; }
.footer-brand p { font-size: 14px; line-height: 1.8; max-width: 280px; color: var(--gray-500); }
.footer h4 { font-size: 14px; font-weight: 600; color: var(--white); margin-bottom: 16px; }
.footer ul li { margin-bottom: 8px; }
.footer ul li a { font-size: 14px; color: rgba(255,255,255,0.4); transition: var(--transition); }
.footer ul li a:hover { color: var(--mystery-cyan); }
.footer-bottom {
  max-width: 1200px;
  margin: 40px auto 0;
  padding: 20px 24px 0;
  border-top: 1px solid rgba(124,58,237,0.08);
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13px;
  color: rgba(255,255,255,0.3);
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
.fade-in { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

@keyframes shimmer {
  0% { background-position: -200% center; }
  100% { background-position: 200% center; }
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .world-showcase { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .npcs-grid { grid-template-columns: repeat(2, 1fr); }
  .leaderboard-header,
  .leaderboard-row { grid-template-columns: 50px 1fr 80px 80px 100px; }
}
@media (max-width: 768px) {
  .nav { display: none; }
  .nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px; left: 0; right: 0;
    background: rgba(10,10,26,0.98);
    border-bottom: 1px solid rgba(124,58,237,0.15);
    padding: 16px;
    backdrop-filter: blur(12px);
  }
  .mobile-toggle { display: flex; }
  .world-showcase { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .npcs-grid { grid-template-columns: repeat(2, 1fr); }
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .leaderboard-header,
  .leaderboard-row { grid-template-columns: 40px 1fr 70px 60px 80px; font-size: 12px; padding: 12px 16px; }
  section { padding: 60px 0; }
  .hero-btns { flex-direction: column; align-items: center; }
  .cta-features { gap: 12px; }
  .cta-features span { font-size: 12px; padding: 6px 12px; }
}
@media (max-width: 480px) {
  .npcs-grid { grid-template-columns: 1fr; }
  .cases-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   LOGIN MODAL
   ============================================================ */
.modal-overlay {
  position: fixed; inset:0; z-index:9998;
  background: rgba(5,5,20,0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display:none; align-items:center; justify-content:center;
  animation: modalFadeIn 0.3s ease;
}
.modal-overlay.open { display:flex; }
@keyframes modalFadeIn { from{opacity:0} to{opacity:1} }

.modal-container {
  background: linear-gradient(145deg, #12122a 0%, #1a1a3a 100%);
  border: 1px solid rgba(124,58,237,0.2);
  border-radius: var(--radius-lg);
  width: 420px; max-width: 94vw;
  box-shadow: 0 0 60px rgba(124,58,237,0.12), 0 0 120px rgba(6,182,212,0.06);
  animation: modalSlideIn 0.35s cubic-bezier(0.22,1,0.36,1);
  position:relative; overflow:hidden;
}
.modal-container::before {
  content:''; position:absolute; top:0; left:0; right:0; height:2px;
  background: linear-gradient(90deg, transparent, #7c3aed, #06b6d4, transparent);
}
@keyframes modalSlideIn {
  from { opacity:0; transform:translateY(30px) scale(0.97); }
  to { opacity:1; transform:translateY(0) scale(1); }
}

.modal-close {
  position:absolute; top:16px; right:16px; z-index:10;
  width:32px; height:32px; border-radius:50%;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--gray-400); font-size:14px;
  cursor:pointer; transition:var(--transition);
  display:flex; align-items:center; justify-content:center;
}
.modal-close:hover { background:rgba(244,63,94,0.15); color:var(--mystery-rose); border-color:rgba(244,63,94,0.3); }

.modal-header { text-align:center; padding:36px 32px 20px; }
.modal-icon {
  width:56px; height:56px; margin:0 auto 12px;
  background: linear-gradient(135deg, rgba(124,58,237,0.15), rgba(6,182,212,0.15));
  border-radius:50%; display:flex; align-items:center; justify-content:center;
  font-size:24px; border:1px solid rgba(124,58,237,0.2);
  animation: modalIconPulse 3s ease-in-out infinite;
}
@keyframes modalIconPulse {
  0%,100% { box-shadow: 0 0 0 0 rgba(124,58,237,0); }
  50% { box-shadow: 0 0 20px 4px rgba(124,58,237,0.15); }
}
.modal-title {
  font-size:20px; font-weight:700;
  background: linear-gradient(135deg, #a78bfa, #22d3ee);
  -webkit-background-clip:text; -webkit-text-fill-color:transparent;
  background-clip:text; margin-bottom:6px;
}
.modal-desc { font-size:14px; color:var(--gray-400); line-height:1.5; }
.modal-body { padding:0 32px 4px; }
.modal-footer { padding:16px 32px 24px; text-align:center; font-size:12px; color:var(--gray-600); }
.modal-footer a { color:var(--mystery-cyan); transition:var(--transition); }
.modal-footer a:hover { color:var(--mystery-purple); }

/* --- Auth Steps --- */
.auth-step { transition: all 0.3s ease; }
.auth-step.hidden { display:none; }

.input-wrap { margin-bottom:20px; }
.input-label {
  display:block; font-size:13px; font-weight:600; color:var(--gray-300);
  margin-bottom:8px; letter-spacing:0.3px;
}
.input-group {
  display:flex; align-items:stretch;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(124,58,237,0.15);
  border-radius: var(--radius-md);
  transition: var(--transition);
  overflow:hidden;
}
.input-group:focus-within {
  border-color: var(--mystery-cyan);
  box-shadow: 0 0 0 3px rgba(6,182,212,0.1);
}
.input-prefix {
  display:flex; align-items:center; padding:0 14px;
  font-size:14px; font-weight:600; color:var(--gray-400);
  background: rgba(255,255,255,0.03);
  border-right: 1px solid rgba(124,58,237,0.1);
  min-width:52px; justify-content:center;
}
.input-field {
  flex:1; padding:14px 16px; font-size:16px;
  background:transparent; border:none; outline:none;
  color:var(--white); letter-spacing:0.5px;
}
.input-field::placeholder { color:var(--gray-600); }
.input-field:focus::placeholder { color:var(--gray-700); }
.input-hint { font-size:12px; color:var(--gray-500); margin-top:6px; min-height:18px; transition:var(--transition); }
.input-hint.error { color:var(--mystery-rose); }
.input-hint.success { color:#22c55e; }

/* --- Code Input --- */
.code-display {
  display:flex; align-items:center; justify-content:center; gap:8px;
  margin-bottom:24px;
}
.code-phone { font-size:16px; font-weight:600; color:var(--white); letter-spacing:1px; }
.code-change {
  font-size:12px; color:var(--mystery-cyan);
  background:none; border:none; cursor:pointer;
  transition:var(--transition); padding:2px 6px; border-radius:4px;
}
.code-change:hover { background:rgba(6,182,212,0.1); }

.code-inputs {
  display:flex; align-items:center; gap:8px; justify-content:center;
  margin-bottom:8px;
}
.code-box {
  width:44px; height:52px; text-align:center; font-size:22px; font-weight:700;
  background: rgba(255,255,255,0.04);
  border: 1.5px solid rgba(124,58,237,0.2);
  border-radius: var(--radius-sm);
  color: var(--white);
  transition: var(--transition);
  outline:none;
}
.code-box:focus {
  border-color: var(--mystery-cyan);
  box-shadow: 0 0 0 3px rgba(6,182,212,0.15);
  transform: translateY(-1px);
}
.code-box.filled { border-color: rgba(6,182,212,0.3); background: rgba(6,182,212,0.06); }
.code-divider {
  width:12px; height:2px; background: var(--gray-600);
  border-radius:2px;
}

.code-resend { text-align:center; margin-top:16px; font-size:13px; color:var(--gray-500); }
.code-resend-btn {
  font-size:13px; color:var(--mystery-cyan); cursor:pointer;
  background:none; border:none; padding:4px 8px; border-radius:4px;
  transition:var(--transition);
}
.code-resend-btn:hover { background:rgba(6,182,212,0.1); }
.code-resend-btn.hidden { display:none; }

/* --- Buttons --- */
.btn-primary.btn-full {
  width:100%; padding:14px 24px; font-size:15px; font-weight:600;
  border-radius: var(--radius-md); border:none; cursor:pointer;
  background: linear-gradient(135deg, #7c3aed, #06b6d4);
  color: var(--white);
  transition: var(--transition);
  position:relative; overflow:hidden;
  display:flex; align-items:center; justify-content:center; gap:8px;
}
.btn-primary.btn-full:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 4px 24px rgba(124,58,237,0.25);
}
.btn-primary.btn-full:disabled {
  opacity:0.35; cursor:not-allowed; transform:none;
}
.btn-primary.btn-full .btn-loading {
  display:none; width:18px; height:18px;
  border:2px solid rgba(255,255,255,0.3);
  border-top-color:white; border-radius:50%;
  animation: btnSpin 0.6s linear infinite;
}
.btn-primary.btn-full.loading .btn-text { opacity:0; }
.btn-primary.btn-full.loading .btn-loading { display:block; position:absolute; }
@keyframes btnSpin { to { transform:rotate(360deg); } }

/* --- Auth Loading --- */
.auth-loading {
  display:flex; flex-direction:column; align-items:center; gap:12px;
  padding:32px; color:var(--gray-400); font-size:14px;
}
.auth-loading.hidden { display:none; }
.auth-loading-spinner {
  width:36px; height:36px;
  border:3px solid rgba(124,58,237,0.15);
  border-top-color:var(--mystery-cyan);
  border-radius:50%;
  animation: btnSpin 0.7s linear infinite;
}

/* --- Toast Container --- */
.toast-container {
  position:fixed; top:24px; left:50%; transform:translateX(-50%);
  z-index:99999; display:flex; flex-direction:column; gap:8px;
  pointer-events:none;
}
.toast-item {
  padding:12px 24px; border-radius:var(--radius-sm);
  color:var(--white); font-size:14px; font-weight:500;
  animation: toastAnim 2.8s ease forwards;
  pointer-events:auto; text-align:center; min-width:200px;
}
.toast-item.success { background:linear-gradient(135deg,#7c3aed,#06b6d4); box-shadow:0 0 20px rgba(124,58,237,0.2); }
.toast-item.error { background:linear-gradient(135deg,#f43f5e,#dc2626); }
.toast-item.info { background:linear-gradient(135deg,#475569,#334155); }
@keyframes toastAnim {
  0%{opacity:0;transform:translateY(-12px)}
  12%{opacity:1;transform:translateY(0)}
  80%{opacity:1;transform:translateY(0)}
  100%{opacity:0;transform:translateY(-8px)}
}